proembryo

例句：

1. 1.The proembryo is the first stage of development in a developing organism.
   胚是发育生物体的第一个发展阶段。
2. 2.During the early stages of development, the proembryo relies on nutrients from its mother's womb.
   在发育的早期阶段，胚依靠母体的子宫中的营养。
3. 3. The proembryo is crucial for the survival and growth of the developing organism.
   胚对发育生物体的生存和生长至关重要。